I have owned my KN7 for nearly 7 years. I use it on gigs every Saturday Night. The only fault that has developed is with the "Bank View Button".
It required numerous presses of the button to activate the Bank View Screen. The fault was traced to be a dry joint on the PC board under the switch.
I'm still very happy with this board as it offers most of the features I need. With the astronomical prices being asked of hard to find 2nd.hand KN7's downunder, it seems hard to justify the purchase of a back-up KN7, when at sometime in the future, the need to purchase a new keyboard will become necessary.
Regards,
Alan